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Dr. James Hansen, who was the lead climate scientist at NASA, and sixteen other top scientists have concluded the Greenland and Antarctic glaciers will melt ten times faster than previous estimates, leading to sea level rise of ten or more feet in as little as 50 years.

In their newly released study: "Ice melt, sea level rise and superstorms: evidence from paleoclimate data, climate modeling, and modern observations that 2 ◦C global warming could be dangerous," the scientists warn that "Amplifying feedbacks in the Southern Ocean and atmosphere contribute to dramatic climate change in our simulations."

We conclude that continued high emissions will make multi-meter sea level rise practically unavoidable and likely to occur this century. Social disruption and economic consequences of such large sea level rise could be devastating. It is not difficult to imagine that conflicts arising from forced migrations and economic collapse might make the planet ungovernable, threatening the fabric of civilization.

They are describing an ocean feedback loop near Antarctica that results in cooler freshwater from melting glaciers forcing warmer, saltier water underneath the ice sheets, speeding up the melting rate.